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CryptoHack

A free, fun platform for learning modern cryptography

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Learn By Doing

Learn about modern cryptography by solving a series of interactive puzzles and challenges. Get to know the ciphers and protocols that secure the digital world by breaking them.

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Level Up

Earn points by solving challenges. Finish categories to earn trophies and gain levels to track your progress. Can you reach the top of the scoreboard?

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Fresh Challenges

We are constantly creating new challenges to keep your crypto knowledge up to date. Expect exciting brainteasers and whole new categories as the site continues to grow.

New Challenges
ECLCG (HITCON CTF) CTF Archive 0
Sus (ImaginaryCTF) CTF Archive 0
Share (HITCON CTF) CTF Archive 0
Leet Universe (ImaginaryCTF (Daily)) CTF Archive 0
Hyper512 (HITCON CTF) CTF Archive 0
Weekly Top Users
#1 abdelhadi 3855
#2 hilalimohammed 3565
#3 adrianvxck81 3545
#4 Ghayati_mohamed 3472
#5 Essaghir 3355
Recent Solves
Quadratic Residues duy
Extended GCD JH_MaRuF
Favourite byte muneeb01
Base64 saki1k0
Hex saki1k0
Recent Solutions
MD0 ispo 0
Sign in Please (HKCERT CTF) ispo 0
A Joke Cipher (HKCERT CTF) infernosalex 0
Lack of Entropy (Firebird Internal CTF) ConnorM 1
Curveball nidanpoudel 0

Level Up

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